Medium-sized Monkeys

Germain's Langur is a lutung species endemic to Thailand, Vietnam, Laos, Cambodia, and Burma. Germain's langur is a terrestrial tree-dwelling species occasionally found in lowlands.

The black-and-white langur is a primate species in the Cercopithecidae family. It was formerly thought to be a subspecies of the Presbytis melalophos (black-crested Sumatran langur). Still, the genetic analysis indicated they were separate species.

The black Sumatran langur is a species of monkey in the Cercopithecidae family that is endemic to Indonesia's Sumatra Island. Presbytis sumatrana was once considered a subspecies of Sumatran Surili. Still, genetic analysis has shown it to be a distinct species.

The Indochinese black langur (Trachypithecus selbstus) is a little-known Lutung endemic to Laos and neighboring Vietnam. Because they live in dense forests and rarely venture outside, observing them in the wild can be difficult.

The Wolf's mona monkey (Cercopithecus wolfi), also called the wolf monkey, is a colorful Old-World monkey in the Cercopithecidae family. Wolf's mona monkeys have huge cheek pouches.

The vervet monkey (Chlorocebus pygerythrus) is an Old World monkey of the Cercopithecidae family endemic to southern and eastern Africa. Not only can vervet monkeys skilfully navigate through the treetops, but they can also swim.

The Schmidt's red-tailed monkey, also called the red-tailed guenon, Schmidt's guenon, or black-cheeked white-nosed monkey is a primate species in the Cercopithecidae family. The Schmidt's red-tailed monkey is named for its red coloration on the underside of its tail, as well as the bicolor coloration of its tail as the reddish color increases from the base to the tip.

The Pagai island macaque (Macaca pagensis), also called the Pagai or Bokkoi macaque is an Old-World monkey native to the Mentawai Islands on the west coast of Sumatra. Groups of Pagai Island macaques consist of approximately 5 to 25 individuals.

The Heck's Macaque (Macaca hecki) is a macaque native to Sulawesi, Indonesia. This Old-World monkey is diurnal. Due to their frugivorous diet, Heck's macaques will likely act as seed dispersers throughout their habitat.

The Gorontalo macaque (Macaca nigrescens), also called the Dumoga-bone macaque, is a species of the primate of the Cercopithecidae family. It is native to the Sulawesi Island of Indonesia.

The booted macaque is a macaque native to Indonesia's Sulawesi Island. This Old-World monkey is diurnal, spending most of the day in trees. A booted macaque monkey's body mass is determined by its sex, with males significantly larger than females.

The toque macaque (Macaca sinica) is a red-brown Old World monkey endemic to Sri Lanka, known as the rilewa or rilawa. Its common name refers to the strand of hair on its head that resembles a brimless hat.

The pig-tailed macaque (Macaca nemestrina), also called the Sundaland pig-tailed macaque and Sunda pig-tailed macaque is a medium-sized macaque native to southern Thailand, Indonesia, and Malaysia. Pig-tailed macaques also have long legs and hairless snouts.

The Selangor silvered langur (Trachypithecus selangorensis) is a leaf monkey living on the west coast of the Malay Peninsula. Like most leaf monkeys, the Selangor silvered langur usually lives in groups of a single adult male and several adult females and their young offspring.

Popa langur (Trachypithecus popa) is a primate species in the Cercopithecidae family. It occurs exclusively in Myanmar. The species is named after Mount Popa, where a population of 100 monkeys lives.

The white-headed langur, also called the Cat Ba langur, is an endangered species of langur native to Guangxi, China. Cat Ba langurs are comfortable in trees or ground but prefer steep cliffs where humans can't set foot.

Tenasserim lutung (Trachypithecus barbei) is a species of lutung. It occurs in Thailand and Myanmar. The species derived its common name from the Tenasserim Hills.

Siberut langurs are native to the islands of North Pagai, South Pagai, and Sipora. Siberut langurs spend over 80 percent of their time resting and foraging and only a tiny portion traveling and socializing.

The silvery Lutung (Trachypithecus cristatus), also called the silvery langur or silvered leaf monkey is an Old-World monkey. Silvery Lutungs primarily live in trees.

The northern pig-tailed macaque (Macaca leonina) is a macaque species in the Cercopithecidae family. Typical of this group of Old World monkeys, northern pig-tailed monkeys are gregarious, living in social groups of 9-81 individuals.

The Spix's night monkey (Aotus vociferans), also called the Spix's owl monkey, Colombian gray nocturnal monkey, and noisy night monkey is a species of night monkey native to South America.

The Napo saki (Pithecia napensis), also called the Napo monk saki, is a species of saki monkey, a type of New World monkey. The species' common name is derived from the Napo River in its locality.

The mustached monkey or moustached guenon (Cercopithecus cephus) is a primate species in the Cercopithecidae family. Moustached monkeys take regular paths through the branches, with each monkey following the next along the same path.

The moor macaque (Macaca maura) is a brown/black haired macaque with a pale rump and bare pink rump skin. Moor macaques appear to be a relatively tolerant macaque species, showing low levels of aggression between group members.

Endemic to the jungles of Borneo in Indonesia and Malaysia, red leaf monkeys get their name from their shaggy reddish-maroon fur. They are also known as maroon-leaf monkeys and maroon langurs.

The Malbrouck (Chlorocebus cynosuros) is an Old-World primate from Africa that belongs to the Chlorocebus genus. The species is sometimes classified as a subspecies of the green monkey (Chlorocebus pygerythrus) or the common grivet (Chlorocebus aethiops).

The Japanese macaque (Macaca fuscata), also called the snow monkey, is a terrestrial Old World species of monkeys endemic to Japan. Japanese macaques from southern regions generally weigh less than those in northern regions of higher altitudes, where there is more snow during the winter months.

Humboldt's white capuchins, also known as white-fronted capuchins, are a species of New-World monkeys and one of the smallest capuchin groups. Humboldt’s squirrel monkeys are usually led by a dominant male and female.

Humboldt's squirrel monkey (Saimiri cassiquiarensis) is a species of squirrel monkey found in South America's tropical rainforests, except for the coastal forests of southeastern Brazil.

The three-striped night monkey (Aotus trivirgatus), also known as the northern owl monkey, Humboldt's Night Monkey, or northern night monkey, is one of several currently recognized species of owl monkeys.

The Azaras capuchin or hooded capuchin (Sapajus cay) is a robust capuchin species. It is found in northern Argentina, southeastern Bolivia, eastern Paraguay, and Brazil. Its habitat consists of humid, subtropical, semi-deciduous, gallery forests and forests in the Pantanales.

The white-faced saki (Pithecia pithecia), also known as the golden-faced saki, Guianan saki, and Guyana saki, is a New World saki monkey species. Typically, they have a lifespan of around 14 years in the wild and have lived up to 36 years in captivity.

The tufted capuchin (Sapajus apella), also called the pin monkey, Guianan brown capuchin, or black-headed capuchin is a New World monkey native to South America and the Caribbean islands of Margarita and Trinidad.

The Grivet monkey (Chlorocebus aethiops) is an Old World monkey with long tufts of white fur on the sides of its face. Grivet monkeys are very social animals. They travel in small groups and are among the few species to have groups with multiple males.

The green monkey (Chlorocebus sabaeus), also called the sabaeus monkey, is an Old World monkey with golden-green fur, pale feet, and hands. Green monkeys' locomotion varies little, regardless of substrate or habitat. In nearly all circumstances, they move quadrupedally in the treetops or on the ground.

The golden-bellied capuchin (Sapajus xanthosternos), also called the buff-headed or yellow-breasted capuchin is a New World monkey species. They spend much time grooming one another for socialization, with the alpha species receiving the most attention.

The golden lion tamarin (Leontopithecus rosalia), also called the golden tamarin, is a small New World primate in the Callitrichidae family. The golden lion tamarin derives its name from its vivid reddish-orange coat and extra-long hair around its face and ears, giving it a distinctive mane.

Geoffroy's monk saki, also called monk saki, is a species of saki monkey, a New-World primate native to South America. A monk saki is one of seven species of New-World arboreal monkeys with a bushy, feathery tail.

The Gabon talapoin, also called the northern talapoin, is a small species of African primate endemic to riverine habitats in Gabon, Equatorial Guinea, Cameroon, the far western Democratic Republic of the Congo, and the western Republic of the Congo.

The Formosan rock macaque also called the Taiwanese macaque, or Formosan rock monkey, is a macaque native to the island of Taiwan. Aside from humans, Formosan rock macaques are the only native primates living in Taiwan.

The Emperor Tamarin is a species of tamarin named for its resemblance to the German Kaiser Wilhelm II. It lives in the states of Acre and Amazonas, western Brazil, and the southwestern Amazon basin.

The Diana monkey is an Old-World primate found in the high-canopy forests of Liberia, Sierra Leone, and the western Ivory Coast. Diana monkeys get their name from the white crescent-shaped headband that resembles the crescent moon on the forehead of the Roman goddess Diana, protector of woodlands and wildlife.

Robust capuchin monkeys, also called crested capuchin monkeys, are capuchin monkeys of the Sapajus genus. Some crested capuchin species are known to use stone tools in the wild. These are used to crack nuts and other seeds, dried fruits, and even oysters.

The crested mona monkey, also called the golden-bellied monkey, golden-bellied guenon, or crowned guenon, is a species of African primate in the Cercopithecidae family in west-central Africa. Like many species of Cercopithecus, the crested mona monkey has large cheek pouches that it fills with seeds and fruit while foraging for food.

The crab-eating macaque also called the long-tailed macaque and known in laboratories as the cynomolgus monkey, is a primate monkey endemic to Southeast Asia. Crab-eating macaque macaques live in multi-male groups comprising around 30 members.

The cotton-top tamarin is another small New-World primate found at the edge of tropical and secondary forests in northwestern Colombia. The common names "cotton-headed tamarin" and "cotton-top tamarin" are derived from the white hairs that spread across the head and flow down the neck.

The coppery titi, or the red titi, is a species of titi, a type of New-World monkey native to South America. Coppery titi monkeys have dense fur that covers most of the body except for the face.

The Guianan squirrel monkey, also called the South American squirrel monkey, is a squirrel monkey found in Guiana, Brazil, and Venezuela. Saimiri sciureus was once thought to belong to the Collins' squirrel monkey and the Humboldt's squirrel monkey. Still, genetic research in 2009 and 2015 showed they were different species.

The capped langur is a type of monkey in the Cercopithecidae family. These langurs can vary in appearance. This Asian primate gets its name from the thick hairs on the top of the head, typically gray or black.

The Crested Black Macaque, also called the Sulawesi Crested Macaque or Celebes Crested Macaque is an Old World monkey native to the Tangkoko Game Reserve in the extreme northeast of the Indonesian island of Celebes (Sulawesi) and neighboring islets.